WBPHE/EE/SMD/NIeT-59 of 2023-24/1

Amount

Inspection and checking out of the defective 2000 kVA Transformer for the sake of fault identification by engaging competent personnel at site.

Disconnecting the relevant HT & LT cable connection and earthing attachment from both side cable entry box and draining the transformer oil out of the chamber after opening the drain plug and storing it in proper way. This includes the cost for transportation of the defective transformer from site to workshop at Kolkata and workshop to site after necessary servicing/repairing along with the charges for loading and unloading with the aid of necessary man power and hired hoisting arrangement.

Dismantling the transformer part by part and de-tanking of the coil-core assembly from HV side followed by segregating all the materials into serviceable and unserviceable ones.

Checking of all brazing / gas welding points of coils and leads for rectification wherever necessary prior to re-insulation. Removal of burrs, cleaning of core assembly and varnishing core limb laminations succeeded by re-insulating the old good coils by supplying required insulating materials such as compressed press board, krap paper, perma wood and SRBG with replacement of allied insulating materials viz. Separators, Spacers, Spacer Lock Sticks, Coil Base & Top, Axial Sticks, Coil Holding Studs etc. from inner & inter-layer of winding including supplying of transformer oil necessary for cleaning of entire core assembly.

Supplying of new annealed tinned copper conductors for complete rewinding of HV & LV side windings (R-Phase) using the existing as well as newly supplied copper conductors. (This includes the deduction of cost for old damaged winding retained by the entrusted agency)

Labour charges for copper windings by engaging competent personnel including cost for lead brazing complete. This includes reassembling the transformer part by part including cores and coils as per its original dimensions complete including tanking.

Replacement of all gaskets and oil seals including supplying of necessary fixing materials such as adhesives etc. This includes physical checking, tightening of HV & LV side and physical checking of all bushings, tank & radiator for oil leakage and cleaning of contacts, bolts & nuts etc.

Heating of the complete core-coil assembly at workshop for removing the moisture and improving IR value up to the mark.

Supply & delivery of transformer oil as per IS 335-1993.

Filling the Transformer oil through filter machine by old oil and new supplied oil after filtration in the 2000 KVA transformer by engaging competent manpower for increasing I.R. value as per direction (For Transformer and OLTC.

Charges for carrying out routine tests on transformer (IR VALUE, MAGNETIC BALANCE, CORE LOSS, COPPER LOSS, HIGH VOLTAGE, DOUBLE VOLTAGE DOUBLE FREQUENCY, VECTOR GROUP, OTI, WTI & BUCHHOLZ RELAY OPERATIONAL CHECK, OLTC MANUAL & AUTO OPERATION CHECK Electrical parameters of repaired transformer shall be same as declared in Manufacturer’s Test Certificate/Name plate details. Permissible variation for % Z (percentage impedance) is acceptable up to ± 5% (five) w.r.t the original. All the instruments/metering equipments involved in testing of the transformers should carry latest calibration certificate as per relevant IS and it should be shown to the testing engineer before commencement of testing.All routine tests shall be carried out in accordance with IS:2026.

Installation of the repaired transformer in position and making all the relevant electrical connections complete followed by testing & commissioning at site.

Add GST @ 18%

SARKAR ELECTRICAL

M/S.S.S.ENTERPRISE